Question

Researchers and the public have long been aware of the possible disastrous consequences of introducing non-native species into ecosystems. Why do populations of non-native introductions like the glassy-winged sharpshooter, kudzu vine, crested wheatgrass or zebra mussels increase in numbers so quickly in comparison to their growth in the areas from which they come? 1- Changed physical conditions, like more fertile soil, additional water or warmer temperatures exist, thereby allowing them to grow more rapidly. 2- Competitors from their native habitat are not present to impede access to resources, and predators, parasites or grazers are not present to control growth, thereby allowing them to grow more rapidly. 3- Increased competition in the new habitat forces them to be extra diligent and increase their biotic potential, thereby allowing them to grow more rapidly.

          Researchers and the public have long been aware of the possible disastrous consequences of introducing non-native species into ecosystems. 

Why do populations of non-native introductions like the glassy-winged sharpshooter, kudzu vine, crested wheatgrass or zebra mussels increase in numbers so quickly in comparison to their growth in the areas from which they come?


1- Changed physical conditions, like more fertile soil, additional water or warmer temperatures exist, thereby allowing them to grow more rapidly.
2- 
Competitors from their native habitat are not present to impede access to resources, and predators, parasites or grazers are not present to control growth, thereby allowing them to grow more rapidly.
3- 
Increased competition in the new habitat forces them to be extra diligent and increase their biotic potential, thereby allowing them to grow more rapidly.

Added by Toto M.

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